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Add prefixIds plugin
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,211 @@ | ||
| 'use strict'; | ||
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| exports.type = 'perItem'; | ||
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| exports.active = false; | ||
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| exports.params = { | ||
| delim: '__' | ||
| }; | ||
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| exports.description = 'prefix IDs'; | ||
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| var path = require('path'), | ||
| csstree = require('css-tree'), | ||
| cssRx = require('css-url-regex')(), | ||
| unquote = require('unquote'), | ||
| collections = require('./_collections.js'), | ||
| referencesProps = collections.referencesProps, | ||
| rxId = /^#(.*)$/, // regular expression for matching an ID + extracing its name | ||
| addPrefix = null; | ||
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| // Escapes a string for being used as ID | ||
| var escapeIdentifierName = function(str) { | ||
| return str.replace(/[\. ]/g, '_'); | ||
| }; | ||
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| // Matches an #ID value, captures the ID name | ||
| var matchId = function(urlVal) { | ||
| var idUrlMatches = urlVal.match(rxId); | ||
| if (idUrlMatches === null) { | ||
| return false; | ||
| } | ||
| return idUrlMatches[1]; | ||
| }; | ||
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| // Matches an url(...) value, captures the URL | ||
| var matchUrl = function(val) { | ||
| var urlMatches = cssRx.exec(val); | ||
| if (urlMatches === null) { | ||
| return false; | ||
| } | ||
| return urlMatches[1]; | ||
| }; | ||
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| // Checks if attribute is empty | ||
| var attrNotEmpty = function(attr) { | ||
| return (attr && attr.value && attr.value.length > 0); | ||
| }; | ||
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| // prefixes an #ID | ||
| var prefixId = function(val) { | ||
| var idName = matchId(val); | ||
| if (!idName) { | ||
| return false; | ||
| } | ||
| return '#' + addPrefix(idName); | ||
| }; | ||
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| // attr.value helper methods | ||
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| // prefixes a normal attribute value | ||
| var addPrefixToAttr = function(attr) { | ||
| if (!attrNotEmpty(attr)) { | ||
| return; | ||
| } | ||
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| attr.value = addPrefix(attr.value); | ||
| }; | ||
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| // prefixes an ID attribute value | ||
| var addPrefixToIdAttr = function(attr) { | ||
| if (!attrNotEmpty(attr)) { | ||
| return; | ||
| } | ||
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| var idPrefixed = prefixId(attr.value); | ||
| if (!idPrefixed) { | ||
| return; | ||
| } | ||
| attr.value = idPrefixed; | ||
| }; | ||
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| // prefixes an URL attribute value | ||
| var addPrefixToUrlAttr = function(attr) { | ||
| if (!attrNotEmpty(attr)) { | ||
| return; | ||
| } | ||
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| // url(...) in value | ||
| var urlVal = matchUrl(attr.value); | ||
| if (!urlVal) { | ||
| return; | ||
| } | ||
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| var idPrefixed = prefixId(urlVal); | ||
| if (!idPrefixed) { | ||
| return; | ||
| } | ||
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| attr.value = 'url(' + idPrefixed + ')'; | ||
| }; | ||
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| /** | ||
| * Prefixes identifiers | ||
| * | ||
| * @param {Object} node node | ||
| * @param {Object} opts plugin params | ||
| * @param {Object} extra plugin extra information | ||
| * | ||
| * @author strarsis <strarsis@gmail.com> | ||
| */ | ||
| exports.fn = function(node, opts, extra) { | ||
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| // prefix, from file name or option | ||
| var prefix = 'prefix'; | ||
| if (opts.prefix) { | ||
| if (typeof opts.prefix === 'function') { | ||
| prefix = opts.prefix(node, extra); | ||
| } else { | ||
| prefix = opts.prefix; | ||
| } | ||
| } else if (extra && extra.path && extra.path.length > 0) { | ||
| var filename = path.basename(extra.path); | ||
| prefix = filename; | ||
| } | ||
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| // prefixes a normal value | ||
| addPrefix = function(name) { | ||
| return escapeIdentifierName(prefix + opts.delim + name); | ||
| }; | ||
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| // <style/> property values | ||
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| if (node.elem === 'style') { | ||
| if (node.isEmpty()) { | ||
| // skip empty <style/>s | ||
| return node; | ||
| } | ||
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| var cssStr = node.content[0].text || node.content[0].cdata || []; | ||
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| var cssAst = {}; | ||
| try { | ||
| cssAst = csstree.parse(cssStr, { | ||
| parseValue: true, | ||
| parseCustomProperty: false | ||
| }); | ||
| } catch (parseError) { | ||
| console.warn('Warning: Parse error of styles of <style/> element, skipped. Error details: ' + parseError); | ||
| return node; | ||
| } | ||
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| var idPrefixed = ''; | ||
| csstree.walk(cssAst, function(node) { | ||
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| // #ID, .class | ||
| if ((node.type === 'IdSelector' || | ||
| node.type === 'ClassSelector') && | ||
| node.name) { | ||
| node.name = addPrefix(node.name); | ||
| return; | ||
| } | ||
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| // url(...) in value | ||
| if (node.type === 'Url' && | ||
| node.value.value && node.value.value.length > 0) { | ||
| idPrefixed = prefixId(unquote(node.value.value)); | ||
| if (!idPrefixed) { | ||
| return; | ||
| } | ||
| node.value.value = idPrefixed; | ||
| } | ||
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| }); | ||
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| // update <style>s | ||
| node.content[0].text = csstree.translate(cssAst); | ||
| return node; | ||
| } | ||
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| // element attributes | ||
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| if (!node.attrs) { | ||
| return node; | ||
| } | ||
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| // ID | ||
| addPrefixToAttr(node.attrs.id); | ||
| // Class | ||
| addPrefixToAttr(node.attrs.class); | ||
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| // href | ||
| addPrefixToIdAttr(node.attrs.href); | ||
| // (xlink:)href (deprecated, must be still supported) | ||
| addPrefixToIdAttr(node.attrs['xlink:href']); | ||
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| // referenceable properties | ||
| for (var referencesProp of referencesProps) { | ||
| addPrefixToUrlAttr(node.attrs[referencesProp]); | ||
| } | ||
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| return node; | ||
| }; |
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